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Old 12-21-2015, 04:05 PM
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Originally Posted by Yadkin View Post
...I inspected the lifters after 300 miles and everything looked fine, no scoring on the sides.
Scoring is one issue but another is debris (or something) holding the check valve open. You can only see this if you take lifters apart. There is no magic here as everything is self-evident. That's the first place I would look. Or, you can simply send them back for another go-around, not knowing why, again.

Originally Posted by Yadkin View Post
...The valve lash adjusters are 7/6"-20, so 3/4 turn equates to about 0.04". The adjuster ball sits in the lifter cup, and of course the rod ball on the bottom sits in the lifter cup. At 0.04" clearance the push rod will maintain its position (but will rattle like heck)...
Preload should be ok at that depth, if you really are going down that far. This requires a 'touch' that most don't have. At .030" preload your pushrods should be solid and quiet, (like mine are). I hope you get to the bottom of this soon. Lifters do not go bad by themselves in 300 miles. - Dave
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